Grinding machine for forming rolls



Aug. 21, 1923. 1,465,538"

H. WICKSTROM ET AL I GRINDING MACHINE FOR FORMING ROLLS [7 Filed May 211921 sl/6' l5 ITNESSES INVENTOR S I v i cw Patented Aug. 21, 1923.

UNEFBE STATES attests earner castes,

HANS WICKSTROM AND PATRICK J. SHEA, 0F WORCESTFR, MASSACHUSETTS,

ASSIGNOBS TO NORTON COMPANY, OF WORCESTER, MASSACHUSETTS, A COBPO RATIONOF MASSACHUSETTS.

GRINDING MACHINE FOR FORMING ROLLS.

Application filed "may 21,

To all, whom it may concern Be it known that we, HANS WIoKs'rRoM andPATRICK J. SHEA, citizens of the United States of America, residing atWorcester, in the county of Worcester and State of Massachusetts, haveinvented certain new and useful Improvements in Grinding Machines forForming Rolls, of which the following is a full, clear, and exactspecification.

-Our invention relates to grinding machines for forming rolls, and moreparticularly to machines having the roll forming attachment shown anddescribed in an application of-C. H. Norton, Serial No. 435,095, filedJan. 5, 1921.

In the machine referred to, it is proposed to form rolls on the wellknown form of plain cylindrical grinding machine, such as is disclosedin the patent to Norton No.'762,838 dated-June 14:, 1904, in which. thework is mounted on a swivel table which is in turn mounted on a slidingtable to be very accurately formed to produce the.

exact form of roll desired, and if made to form theoretically accuraterolls, in practice it is found that the bar will frequently have to bere-scraped or ground, due to the inherent characteristics of the machinein which it is to be used, in order to produce a roll of the exact shapedesired. This scraping toget the exact form of bar re quired is ofcourse a slow and tedious operation. Furthermore, it becomes necessaryto supplya separate .bar for each form of roll it is desiredto grind onany particular machine, which involves considerable expense and. delayin changing the bar. Since a bar'can be used-only on the particularmachine for which it is fitted, its use is further limited byxthisconsideration.

Itisthereforean object of our invention 1921. Serial No.471,413.

to overcome these difliculties by making the forming bar itselfadjustable in thickness at a plurality of points along its length sothat its form can be readily and quickly changed to suit the machine onwhich it is to be used and to adapt it to grind rolls of differentforms.

Referring to the accompanying drawings, in which like referencecharacters indicate like parts:

. LFigure 1 is a front elevation of a machine equipped with the formingattachment with which our improved forming bar is adapted to be used;

Fig. 2 is a plan view of the work table of the machine shown in Fig. 1;

tional view through the roller-carrying brackets, lower table and base,showing the forming bar in section in its position be-.

tween the rolllers, the section being taken approximately on the line3-3 of Fig. 1;

Fig; 4 1s a fragmentary plan of parts shown in Fig. 3;

Fig. 3 is an enlarged fragmentary sec- Fig. 5 is a plan view of theforming bar, I

parts being broken away, and Fig. 6 is a similar view on an enlargedscale'to more glearly show the means for adjusting the In the specificembodiment of our invention selected for illustration, we have shown ourdevice applied to a grinding machine of the type shown in the patentabove referred to, and in which the work table 1 is mounted to slidelongitudinally on the usual v ways on the base 2 and is provided withthe usual means for traversing it either by hand or, automatically, asis fully described in said prior patent. In Fig. 3 we have shown onlythe hand traversing means, which con.- sists of a. rack 3 rigidlyconnected to the under side of the table 1 and'driven from the handwheel} through the gearing 5, shaft 6 and pinion 7, the latter engagingthe teeth of the rack. On the table 1 is mounted the transverselymovable table 10 which may be of the usual swivel construction, thepivot being indicated at 9 (Figs. 1 and 2). On

and tailstock 12 which may be of any suitable construction forsupporting and rotating the work.. Where the work comprises a heavy roll13 having end bearings 14,

.the table 10 are mounted the headstock 11" we preferably support 1t inwork supports 15 with or without the use of the tailstock and rotate itby having its squared end 16 engage a similarly shaped openlng 17 1n adriven member 18 on the headstock 11. We have shown the latter as beingmotor driven in a manner similar to that shown in the atent to C. H.Norton No. 1,152,434 dated beptember 7, 1915. We do not desire to belimited to the specific manner of supporting and rotating the work whichis merely illustrative and forms no part of the present invention.

In order to eifect a relative transverse movement between the tables 1and 10 while the work is traversing past the grinding wheel 19 to givethe desired form to the work, we provide opposed follower members suchas the rollers 20 and 21 between which is supported a forming bar 22 ofde sired configuration and these rollers are held against the oppositesides ofthe bar by any suitable means such as the spring 23. In thepresent instance we have shown our device adapted for crowning rolls andthe rollers are arranged adjacent one end of the tables while the table10 is swivelled as at 9. The forming bar may be tapered from end to end.It is supported by a block 25 (Figs. 3 and 4) between the rollers and abracket 26 (Fig. 1) extending upwardly from the base. The bar is pivotedto this bracket to allow swinging movement there of. We may connect thebar as by screws 28 to a short arm 29 which is in turn pivoted at 27 tothe bracket 26.

In order to avoid the necessity of carrying a number of bars with eachmachine where it is desired to grind rolls with difierent heights ofcrown, for example, on the same machine, we make the forming bar 22adjustable in width, and we may accomplish this by the constructionshown in Figs. 3 to 6. We have there shown the forming bar as beingsplit, as by means of a saw cut 31, substantially from end toend (seeFigs. 5 and 6) and as being provided at a point intermediate its endsand preferably at, frequent intervals along its length with push andpull screws 32, 33 arranged in pairs. Dowel pins 34 are also provided atdifferent points along the length of the bar to hold the split parts ofthe bar in suitable opposed relation. It will be understood that thescrews 33 for pulling the split portions of the bar together have theirheads 35 arranged in countersunk recesses so as to be at all times belowthe surface on which the rollers travel while the push screws 32 arealso at all timesbelow the surface of the bar. These pairs of push andpull screws can be arranged at suitable intervals along the bar, and .wehave found that spacing them about 4 inches apart will make pro- VlSlOIlfor a very accurate adjustment of the bar. By this arrangement the barcan be pivots arranged in opposed relation at the right-hand end of thetables as shown in 1 Figs. 1 and 2. The inner roller 20 is'located in adownwardly opening recess 36 formed in a bracket 37 which is preferablyremovably secured to the end of the swivel table 10 as by screws 38. Aheaded stud 39 supports the roller and serves as a pivot pin therefor.We have shown this stud securely held as by set screws 40 in a hole inthe bracket 37. The outer roller 21 is shown supported in a bracket 41suitably connected to the table 1. We have shown it formed integrallywith the table to provide a rigid construction and to render itsmanufacture easy. An upwardly opening recess 42 is provided in thisbracket to receive the roller 21 and a hole is provided in the bracketbelow said recess and opening thereinto to receive the lower end of thestud 44 on which the roller is, pivoted. The upper end of said pinextends into a hole 45 formed in a top plate 46 closing the recess inthe bracket and secured thereto by screws 47.

It may be desirable, under certain conditions, to effect a slightlateral adjustment of one of the rollers 20 or 21. We have provid'ed aconstruction in which the axis of the v roller 21 is made adjustable andwe conveniently accomplish this adjustment by making the part 48 of thestud 44 on which the roller is pivoted eccentric to the end portion, byextending the upper end portion beyond the top plate 46, and forming itwith a squared portion 49 for engagement with a suitable tool forrotating it. Rotation of the stud will obviously shift the axis ofrotation of the' roller 21. We may provide this stud between the squaredportion 49 of the top plate 46 with a' tapered collar 50 provided withgraduati ns 51 cooperating with a suitable index 5 on the top plate forindicating the amount of lateral movement of the roller axis andconsequently of the end of the swivel table. When once adjusted, thestud is locked in place by suitable clamping screws 53.

In the operation of our machine, supposing that it is desired to grind aroll with a given amount of crown and so that the surface of the roll iscurved uniformly from end to end, a templet or forming bar 22 isadjusted by the screws 32, 33 to give it a substantially straight taper(from end to nd. The table 14% fil'fil mOVed to bring one end of theroll, let us say the left-hand end, Figs. 1 and 2, opposite the grindingwheel and the grinding wheel is fed into contact with the roll by theusual feeding mechanism indicated at 61, Fig. 1. If the roll iscylindrical and its axis is parallel with the path of reciprocation orthe ways of the table 1 when the grinding wheel is opposite thelongitudinal center of the roll, then with the parts in the positionfirst supposed, the left-hand end of the roll is nearer to the grindingwheel axis than the righthand end. As the table is traversed to the leftfrom this position, the swivel table is swung by the tapered bar untilthe work axis is parallel to the table ways when the wheel is oppositethe center of the roll and from there on the roll axis will incline inthe opposite direction to the table ways until the wheel again touchesthe roll at the right-hand end. The grinding is then continued until thewheel has ground the entire surface of the roll and the roll has reachedthe desired dimensions. If the roll axis should happen to be slightlyout of alignment with the table ways, and this can be determined bycalipering the opposite ends of the roll after they have both beenground to some extent, in which case they will be of differentdiameters, it will be necessary to effect some adjustment to bring aboutcorrect alignment. This is conveniently accomplished in our device byapplying a wrench to the squared portion of the stud on which the roller21 is eccentrically pivoted and moving the nivoteither toward or awayfrom the axis of the roll as may be required to effect the necessaryalignment.

If it is found that the roll does not have the desired shape due to thespring of the table or from other causes, the forming bar is adjusted tocorrect such inaccuracies in form of the roll and this can be veryquickl done by my improved construction. t will be seen then that wehave provided a very simple and convenient device for adapting theforming bar to the inherent characteristics of different machines, orfor adapting it to the same machine under different conditions of oeration, such as would be met with grin ing rolls of different sizes andwith different heights of crown.

While we have shown our improved formin device used in connection withthe speci 0 machine disclosed and claimed in the application abovereferred to, it is obvious that changes may be made in the specificconstruction of our device and that equivalent elements may besubstituted for parts herein disclosed without departing from the scopeof our invention as expressed in the claims appended hereto.

iiaving thus described our invention, what we claim as new and desire tosecure by Letters Patent is:

1. A grinding machine having relatively reciprocating work and wheelsupports, one of said supports being also movable transversely duringreciprocation to form the work, a follower on said transversely movablesupport, a forming bar against which said follower is held duringreciprocation, and means to position the bar and hold said bar andfollower in engagement during reciprocation, said forming bar havingmeans for adjusting its width at a point intermediate its ends.

2. A grinding machine having relatively reciprocating work and wheelsupports, one of said supports being also movable transversely duringreciprocation to form the work, a follower on said transversely movablesupport, a longitudinally divided forming bar against which saidfollower is held during the reciprocation, means for adjusting the widthof the bar at a plurality of points along its length, and means toposition the bar and hold the bar and follower in contact duringreciprocation.

3. A grinding machine comprising a base, a reciprocating table thereon,a transversely movable work-carrying table mounted thereon, a, followeron each of said tables, and means including a forming bar held againstlongitudinal movement and extending between said followers to move thetables relative to each other as they reciprocate, said bar beingadjustable in width at a plurality of points along its length.

4. In a machine for grinding cylindrical work, a forming bar split in aplane at right angles to its operative surface, and means for adjustingthe width of the bar andfor holding it in adjusted position.

5. In a machine for grinding cylindrical work, a forming bar split in aplane at right angles to its operative surface, means for ad usting thewidth of the bar at a plurality of points along its length and forholding it in adjusted position comprising push and pull screws arrangedin pairs, and means for holding the split portions of the bar in opposedrelation.

Signed at Worcester, Massachusetts, this 20th day of May 1921.

HANS WICKSTROM. PATRICK J. SHEA.

